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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Zea perennis ： ウィキペディア英語版 Zea perennis ''Zea perennis'', the perennial teosinte, is a true grass species in the genus ''Zea'' and a teosinte. It is one of the two perennial species in the genus ''Zea''. The other perennial, ''Z. diploperennis,'' is the sister taxon of ''Z. perennis''. Those two species also form a clade with ''Z. luxurians''. Together, the three species make up the ''Luxuriantes'' section in the genus ''Zea''.〔Doebley, J. (1990). Molecular Systematics of Zea (Gramineae). Maydica, (35), 143–150.〕 ''Z. perennis'' is the sole tetraploid in the genus and fertile hybrids with diploid ''Zea'' species are rare. Ribosomal ITS evidence suggested introgression between ''Z. perennis'' and ''Z. mays'' that must have come from either crossing the ploidy barrier or been from the diploid ancestral pool. ''Z. perennis'' is generally considered to be an autotetraploid from some ancestral population of ''Z. diploperennis''.〔Buckler, E. S., & Holtsford, T. P. (1996). Zea systematics: ribosomal ITS evidence. Molecular biology and evolution, 13(4), 612–22.〕 Due to the economic importance of maize, significant scientific interest exists in using the genes of the other ''Zea'' species for crop improvement. ''Z. perennis'' is of particular interest because of the potential for maize to become a perennial crop. However, difficulty in using genes from ''Z. perennis'' in ''Z. mays mays'' for crop improvement has occurred because the genes used often contain unwanted teosinte traits. ''Z. perennis'' is tropical and not winter hardy, which has led to problems in using its genes to make a perennial form of maize.〔Jackson, W., & Kirschenmann, F. (2009). A 50-Year Farm Bill. The Land Institute.〕 To overcome this, breeding efforts have focused on deeper rhizomes that can survive below the frost line.〔http://www.perennialsolutions.org/perennial-cereal-grains-a-promise-requiring-patience-and-prioritization〕 == References == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Zea perennis」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.